Mercurial > prosody-modules

annotate mod_auth_external/mod_auth_external.lua @ 846:5ddc43ce8993

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mod_auth_external: Work even when the LuaProcessCall library isn't available.
author Waqas Hussain <waqas20@gmail.com>
date Sat, 13 Oct 2012 02:33:06 +0500
parents 960007b0901e
children 490cb9161c81
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1 --
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2 -- NOTE: currently this uses lpc; when waqas fixes process, it can go back to that
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3 --
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4 -- Prosody IM
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5 -- Copyright (C) 2010 Waqas Hussain
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6 -- Copyright (C) 2010 Jeff Mitchell
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7 --
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8 -- This project is MIT/X11 licensed. Please see the
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9 -- COPYING file in the source package for more information.
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10 --
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13 local nodeprep = require "util.encodings".stringprep.nodeprep;
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14 --local process = require "process";
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15 local lpc; pcall(function() lpc = require "lpc"; end);
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16
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17 local config = require "core.configmanager";
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18 local log = module._log;
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19 local host = module.host;
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20 local script_type = config.get(host, "core", "external_auth_protocol") or "generic";
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21 assert(script_type == "ejabberd" or script_type == "generic");
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22 local command = config.get(host, "core", "external_auth_command") or "";
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23 assert(type(command) == "string");
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24 assert(not host:find(":"));
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25 local usermanager = require "core.usermanager";
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26 local jid_bare = require "util.jid".bare;
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27 local new_sasl = require "util.sasl".new;
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28
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29 local function send_query(text)
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30 local tmpname = os.tmpname();
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31 local tmpfile = io.open(tmpname, "wb");
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32 tmpfile:write(text);
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33 tmpfile:close();
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34 local p = io.popen(command.." < "..tmpname, "r");
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35 local result;
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36 if script_type == "ejabberd" then
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37 result = p:read(4);
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38 elseif script_type == "generic" then
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39 result = p:read();
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40 end
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41 os.remove(tmpname);
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42 p:close();
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43 return result;
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44 end
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45
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46 if lpc then
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47 --local proc;
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48 local pid;
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49 local readfile;
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50 local writefile;
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51
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52 function send_query(text)
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53 if pid and lpc.wait(pid,1) ~= nil then
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54 log("debug","error, process died, force reopen");
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55 pid=nil;
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56 end
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57 if not pid then
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58 log("debug", "Opening process " .. command);
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59 -- proc = process.popen(command);
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60 pid, writefile, readfile = lpc.run(command);
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61 end
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62 -- if not proc then
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63 if not pid then
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64 log("debug", "Process failed to open");
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65 return nil;
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66 end
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67 -- proc:write(text);
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68 -- proc:flush();
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69
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70 writefile:write(text);
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71 writefile:flush();
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72 if script_type == "ejabberd" then
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73 -- return proc:read(4); -- FIXME do properly
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74 return readfile:read(4); -- FIXME do properly
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75 elseif script_type == "generic" then
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76 -- return proc:read(1);
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77 return readfile:read();
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78 end
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79 end
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80 end
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81
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82 function do_query(kind, username, password)
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83 if not username then return nil, "not-acceptable"; end
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84 username = nodeprep(username);
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85 if not username then return nil, "jid-malformed"; end
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86
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87 local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
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88 local len = #query
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89 if len > 1000 then return nil, "policy-violation"; end
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90
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91 if script_type == "ejabberd" then
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92 local lo = len % 256;
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93 local hi = (len - lo) / 256;
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94 query = string.char(hi, lo)..query;
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95 end
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96 if script_type == "generic" then
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97 query = query..'\n';
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98 end
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99
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100 local response = send_query(query);
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101 if (script_type == "ejabberd" and response == "\0\2\0\0") or
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102 (script_type == "generic" and response == "0") then
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103 return nil, "not-authorized";
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104 elseif (script_type == "ejabberd" and response == "\0\2\0\1") or
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105 (script_type == "generic" and response == "1") then
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106 return true;
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107 else
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108 log("debug", "Nonsense back");
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109 --proc:close();
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110 --proc = nil;
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111 return nil, "internal-server-error";
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112 end
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113 end
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114
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115 local host = module.host;
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116 local provider = {};
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117
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118 function provider.test_password(username, password)
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119 return do_query("auth", username, password);
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120 end
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121
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122 function provider.set_password(username, password)
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123 return do_query("setpass", username, password);
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124 end
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125
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126 function provider.user_exists(username)
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127 return do_query("isuser", username);
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128 end
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129
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130 function provider.create_user(username, password) return nil, "Account creation/modification not available."; end
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131
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132 function provider.get_sasl_handler()
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133 local testpass_authentication_profile = {
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134 plain_test = function(sasl, username, password, realm)
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135 local prepped_username = nodeprep(username);
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136 if not prepped_username then
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137 log("debug", "NODEprep failed on username: %s", username);
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138 return "", nil;
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139 end
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140 return usermanager.test_password(prepped_username, realm, password), true;
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141 end,
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142 };
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143 return new_sasl(host, testpass_authentication_profile);
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144 end
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145
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146 function provider.is_admin(jid)
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147 local admins = config.get(host, "core", "admins");
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148 if admins ~= config.get("*", "core", "admins") then
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149 if type(admins) == "table" then
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150 jid = jid_bare(jid);
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151 for _,admin in ipairs(admins) do
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152 if admin == jid then return true; end
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153 end
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154 elseif admins then
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155 log("error", "Option 'admins' for host '%s' is not a table", host);
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156 end
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157 end
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158 return usermanager.is_admin(jid); -- Test whether it's a global admin instead
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159 end
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160
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161 module:provides("auth", provider);